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To all whom it Imay concern:

N. Puri-In, or'NEW YORK, N5. Y.

Letters-'Patent No. 95,508, dated October' 5, 1869. l

- IMPROVEMENT I IN LATCHES.

The Schedule referred to in these Letters Patent and making part of thesame.

Be it known that I, N. IETR, of the city, county, and State of New York, have invented certain new and useful Improvements in Locks; and I do hereby declare the following to be a full, clear, and exact description of the Same, reference bcinghad to the accompanying drawings, making a part of this specification, in Whichv Figure 1 represents a plan Figure 2 represents a transverse section through the sume.

Figure 3 represents a cross-section through the keyhnh, taken at the red line :c x oi'g. 3.

Figure 4 represents, in perspective, the key-barrel und its spring, removed from the lock.

Figure 5 represents the key in perspective view.

l Similar letters ot' reference, where they occur in the separate figures, denote like parts ofthe lock inail of the drawings. l

This invention relates to a dead-latch lock, in which the bolt is drawn into the lock by an eccentric working in a yoke connected to said bolt, and projected by a semi-elliptic or other spring, and in which the bolt, which is hcvelled as it strikes the bevel on the keeper, as in the act ot' shutting the door, can enter the lock without moving or using the eccent-lic; and it relates, further, to :they-barrel and spring within the hub of thc eccentric, so that with the proper key," the barrel und hub may be connected through the medium of the spring and key, and the eccentric and bolt oper ated hy turning the key.

To enable others skilled in the art to Inake and use my invent-ion, I will proceed to describe the same with reference to the drawings'.

ln thel lock-case A, there are guides B B, against which the straight portions G G offthe yoke D'move. lhis yoke may be cast in one piece with the bolt E, or made separate therefrom, and then united to it.

.lhe eccentric l", that works in the yoke` D,to move the bolt into the lock-case, has spindles, or journals (i H connected with it, and which project each way troni-it, the one, G, having a knob, I, fastenedv on to it, hy which the eccentric and bolt may be moved on or from the inside of the door.

'.lhc other spindle, or journal H is tubular, and covered by the cap J, on the cover I( of the lock, and

through this cap J there is no opening but the keyopening a a, and Aeven this opening does not expose this spindle, or journal, as the key-opening leads into a key-barrel, L, Wit-hin thc tubular spindle H, and this key-barrel must bc fastened to the spindle, before the spindle, eccentric, or bolt, can be moved by leven the kev.

'lhisis accomplished as follows:

On the key-barrel L there is a' spring, b, and in the of the interior of the'lock. v

interior of the hollow spindle- H there is a recess, c, corresponding to said spring. l

'lhekey M being inserted,its Ward, or projection d, taking the slot e next to the spring 11, presses said spring into the recess c inthe spindle H, which unites 'the barrel and spindle. Then, by turning the key, the

' the eccentric upon it.

The spring is of a semi-elliptic-plate form, for the sake of economizing space and, consequently, ,size of the lock, while sniiicient power is attained by its use.

At diametrically opposite sides of the eccentric there are nicks,or depressions g g, into which a click, or projection, h, on the rear ofthe yoke D, takes, when they come opposite to said projection, and which hold the eccentric and yoke together by 'a force equal to that of thepressure of the spring f, but are readily released by the turning of .theknoh or of the key.

`There is Ln-opening, or recess, fi, in the bolt E, which will take in the part of the eccentric Fn'ext to it, when said bolt is pressed into the lock, as in .the act of closing door, 'and when the bolt in such case passes the bevel on the keeper, the recoil of the 'spring will shoot the bolt out again, and into the keeper.-

Thus, while the bolt can only be moved'inand out by the use of the knob or key from the outside, a'nd through the actionA of the eccentric, yet the bolt, asl above described, can be forced in and shot out with- "out moving the eccentric, viz, by the act ofclosing the door and the bevels on the bolt and keeper.

Having thus fully described my invention, and shown -how the same is operated,

What I claim therein as new, and desire to 'secure by Letters Patent, is-

l. In combination with a bolt, yoke, and eccentric,

Awhen so arranged as that the bolt moves directly toward and from the eccentric, and operated from the exterior by a knob or key, and controlled by a spring, arecess, i, in the front of said bolt, that allows it to be forced into the lock, as in the act of shutting the door to pass over, without 'moving the eccentric, as and for the purpose substantially as described.

2.- Also, in ,combination with the spindle H and its recess c, the key-balrel L and its spring l), so that the insertion ot' the key shall form aconnection between said spindle and barrel, and cause them to move together by the turning of the key, to move the bolt, substantially' as described.

N. PETR. y Witnesses:

WILLIAM S. LIVINGSTON, Jr., JOHN WALKER. 

